It _ Mary who was in the room.I'm sure it _
— It ___ Mary who was in the room.
— I'm sure it ___.
A.can't be,can't be B.must be,mustn't be
C.must be,can't be D.can't be must be
人气：488 ℃ 时间：2020-01-30 11:06:22
解答
选C吧
It ___ Mary who was in the room.
推测,用must be,不用can't be 吧
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